Outer covering for the moistening and inking form rollers of lithographic-offset-printing machines



May 27, 1930. MORRls 1,760,370

OUTER COVERING FOR THE MOISTENING AND INKING FORM I ROLLERS OF LITHOGRAPHIC OFFSET PRINTING MACHINES Filed Aug. 24, 1928 INVENTOR,

2 ATTORNEY Patented May 27, 1930 UNITED STATES PATENT OFFICE EDWIN 1B. M63318, O13 CLAYTON, MISSOURI OUTER COVERING FOR THE MOIBTENING AND INKING FORM ROLLERS OF LITHO- GRAPHIO-OFFSET-IPBINTING MACHINES Application filed August 24, 1928. serial No. 801,836.

This invention relates to new and useful improvements in the outer coverings for the moistening and inking form rollers of lithographic offset printin machines.

It is the principal o ject of my invention to provide for such rollers, a cylinder covering which may be easily slipped on, and removed from, the rollers in a very short time.

At present it requires a long period, and to be more definite, approximately three hours, to renew the soiled coverings of the dampening rollers of a lithographic offset printing machine. These coverings, soiled by ink and the moistening fluid, can be renewed only b scraping them off the rollers with a knife and sewing the new ones on. This is a long and tedious process, which my invention is designed to obviate by providing a cylinder covering which maybe slipped off a dampening roller shaft and replaced by a new one in a few minutes.

It is another object of my invention to provide such an outer covering that is constructed of layers of suitable fabric applied to an inner paper or fiber tube treated with a moisture-proof liquid, which is adapted to be easily slipped on and off the roller shaft.

Other important and incidental objects will be brought out in the following specification and particularly set forth in the subjoined claims.

In the accompanying drawings illustrating the different forms of embodiment of my invention, Figure 1 is a longitudinal sectional view taken through the moistening roller of a lithographic offset printing machine, showing my improved outer covering locked in place on the roller shaft. Figure 2 is a side elevational view thereof, showing said covering on the shaft. Figure 3 is a cross sectional view taken through the same on the line 3-3 of Figure 2. Figure 4 is a cross sectional view taken through a triangular member to which my outer covering has been applied.

Figure 5 of the drawings is a cross sectional y printing plate (not shown).

view taken through the inking form roller shaft of a lithographic offset printing machine, and a covering therefor comprising an inner paper tube treated with a moistureproof liquid, two intermediate layers of flannel and an outer cylindrical tube of rubber. And Figure 6 is a perspective view of a roller shaft, showing one of my outer coverings being slipped thereon.

Referring to the accompanying drawings for a detailed description of my invention, the numeral 1 in Figures 1, 3 and 6 designates a moistening roller shaft for a lithographic- This shaft is made of suitable metal and is formed at one end with a flange 2. Beyond this flange the shaft terminates in a stepped extension comprising portions 3, 4 and 5 of successively reduced diameters, and has a flange 6 between its portions 4 and 5.

At its outer end the shaft 1 is formed with a threaded extension 7 of reduced diameter, and from which there axially projects a stepped extension 8. (See Figures 1, .2 and 6.)

The shaft 1, as is well known in the art, is adapted to receive an outer coverin for the purpose of moistening the form p ate of a lithographic offset printing machine. This covering distributes over the plate a liquid which is repulsive to grease or ink, and it is the object of my invention to provide such a covering which not only spreads this liquid evenly and equally over the plate, but which can be slipped on and oflf the shaft in a few minutes as against the time measured in hours which is now required to scrape from the dampening roller shafts of such machines the coverings which are sewed onto them.

My roller shaft covering is preferably made in a plurality of layers. In Figure 3 the inner layer comprises a paper or fiber tube 9 which has been treated with a moisture-proof liquid. Such a tube may be easily slipped on be easily slip the shaft 1, and may be as easily removed therefrom for renewal.

Preferably secured by stitching to the inner tube 9 in Figure 3 is a layer 10 of thin wool. around which there is stitched a layer 11 of heavy wool. Stitched to the heavy wool layer 11 is an outer covering 12 of cotton fabric such as molleton which forms a suitable absorbent for the moistening fluid and which it subsequently a lies evenly and equally to the form plate. is entire roller shaft cover, from the inner paper tube 9 to the outer cotton fabric cylinder 12, forms an economical and efficient unit which may d on the shaft and which, when soiled, may as readily removed therefrom witgout the laborious operation of scraping ito After the outer covering is slipped on the shaft 1 against the flange 2, a washer 13 is pressed against it by a retaining nut 14 screwed on the threaded portion 7 of the shaft, after which a lock nut 15 is screwed on the same against the retaining nut. To remove the covering 12 after it has become soiled, it is only necessary to take off the washer 13 and the nuts 14 and 15, whereupon the roller shaft covering may be slipped off with ease and thrown into a refuse can.

In Figure 4 I have shown a roller shaft 16 which is triangular in cross section and to which the outer covering just described has been ap lied. My outer covering is not only adap for use with a circular shaft, but may be conveniently and quickly applied to :i member of any other contour in cross sec- In Figure 5 I have shown a cylinder coverin for the inking form roller shaft 17 of a lit ographic ofiset printing machine. This covering comprises an inner paper or fiber tube 18, two surrounding layers 19 and 20 of flannel and an outer cylindrical tube 21 of rubber slipped over the outer flannel layer 20.

Having described my invention, I claim:

1. A covering for the moistening roller shafts of lithographic ofiset printing machines, comprising an inner tube treated with a moisture proof liquid free to be axially slipped on each shaft, and absorbent material secured around said tube.

2. A covering for the moistening roller shafts of a lithographic offset printing machines, comprising an inner paper tube treated with a moisture proof liquid and free to be axially slipped upon each shaft, and layers ofbeabsorbent material secured around said tu wool secured around the thin wool layer, and a cotton fabric layer secured around the heavy wool.

4. A covering for the moistening roller shafts of-lithographic offset printing machines, comprism an inner tube of paper or fiber a layer 0 thin wool secured around said tu a layer of heavy wool secured around the layer of thin wool, and an outer lay)? of molleton stitched around the inner tu In witness whereof I have hereunto set my hand this 22nd day of Au ust, 1928.

EDWI B. MORRIS.

3. A covering for the moistening roller 

